Ejiectbic switch



F. KRATZ.

ELECTRIC SWITCH.

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1,31 1,974. 'Patentedmlg 5,1919.

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UNITED STATES FRANZ KBATZ, OF STUTTGART, GERMANY, ASSIONOB, BY MESNE ASSIGNMENTS, T0 AMERICAN BOSCH HAGNETO CORPORATION, OF NEW YORK, N. Y., A CORPORATION 0F NEW YORK.

ELECTRIC SWITCH.

Spectcaticn of Letters Patent.

Patented Aug. 5, 1919.

Application nlcd April 30. 1914. Serial lo. $85,847.

To all whom z't may concern .Be it known that I, FRANZ KnA'rz, engi neer, a subject of the Emperor of Germany, residing at and whose post-oiiice address 1s Stuttga rt, 59* Schloss strasse, Germany, have invented certainv new and useful Improvements in Electric Switches; a d I do hereby declare the followinfr to be a ull, clear, and exact, description ol? the invention,` such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention discloses an electric switch of large current capacity having a bridge member vith contact lingers for completing the circuit between the switch studs with a strong wiping contact, and also having a circuit breaking member for interrupting the circuit between the studs, the two members being adapted to be moved in a straight line by means of an operating lever fastened thereto. In the preferred form of construction, the bridge member is made up of superposed plate springs cut-out and bent to form depending contact. fingers,

and the circuit breaking member is made up of separated spring plates carrying carbon contacts at their outer ends between the con tact fingers and fastened at their central portion to the. bridge member so that the carbon contacts are separated Afrom the switch studs in movements of substantial parallel translation. In this way, there is produced a cheap and easily assembled switch having a large Contact surface and adapted to interrupt the. circuit with a quick and reliable break.

In the accompanying drawings, illustrating the preferred form of m v invention,

Figure 1 is a longitudinal elevation, partly in central section;

Fig. 2 is a plan view; and Fig. 3 is a section on line 3 3 of Fig. 2. The bridge member e comprises three -platesprings of metal which are cut-out 4and tact finger is slight y inclined outwardly of' the line perpendicular to the contact surface of the stud, and the innermost plate spring of each contact linger is slightly inclined inwardly ofi this line. so that during the y,switchingmovements the plate sprin of each contact finger spread ndependentir of each other and effect a strong wi ing action on the stud, and produce va relia le and accommodatin contact at each finger over a com arative y large area.

Tie circuit breaking member comprises the two plate springs g of metal cut-out along the lines k to form the arms g and the connecting end portions l. The plate springs are separated from each other by the bushing z' an mounted directly upon the plate springs of the bridge member a. The two plate springs are fastened together at their outer ends by the hollowr rivets h, which carry the carbon blocks f with the contact surfaces thereof somewhat below the level of the contact surfaces of the fingers c. In this way, the carbon contacts f engage the studs d and e before the enga ement of the contact fingers c, and they isengage the studs only after the contact -fingers are disengaged therefrom, the carbon contacts being pressed into intimate engagement with the switch studs and being dlsen aged therefrom in movements of substantial parallel translation, whereb the' entire contact surface of each carbon lock is disengaged as a. whole.

Thel bridge member and the circuit breaking member are fastened together between the fianges of the sleeve n., the insulating bushing o being interposed to insulate the line substantially perpendicular to the contact surfaces of the switch studs, that is, in substantially the direction of the contact fingers c, and this movement of the operating lever may be brought about byhand in any :suitable wav, or by connection to thecore or armature of anelectromagnet.

Having thus described my invention, what I claim is:

In an electric switch having studs with smooth contact faces, n conducting brid e member adapted for perpemliculur switc ing movements relatively to said ,contact faces and comprising a plurality of superposed cut out and bent spring plates having forked ends with the prongs thereof extend` ing member com lisin two separated und parallel spring p abes ustencd at their central portions to the bridge member so as to produce between the contacts and studs cil'- cuit breaking movements of substantially parallel trr" lation.

In testimon whereof I uliix my signature, 20

in presence o two witnesses.

FRANZ KRATZ:

Witnesses:

PAUL WoLrAnT, REINHOLD ELwER'r. 

